Air purifier



FIG. 1 is a perspective view of an air purifier showing the new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a left-side elevation view thereof;

FIG. 5 is a right-side elevation view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is a partial perspective view showing the air purifier in a state of use.

The evenly spaced broken lines and unshaded areas depict portions of the air purifier that form no part of the claimed design. The dot dash dot broken line in FIG. 8 denotes the boundary of the partial view and forms no part of the claimed design. 

CLAIM We claim the ornamental design for an air purifier, as shown and described. 